@misc{indiciae9eb5cee920fb,
  title = {Probabilistic methodology for GRASS; Gas Resource Assessment Spreadsheet System},
  author = {R. A. Crovelli and R.H. Balay},
  year = {1996},
  doi = {10.3133/ofr96296},
  url = {https://pubs.usgs.gov/publication/ofr96296},
  note = {Source identifier: ofr96296}
}